Catalina Island is about 1.9 times smaller than Gaza Strip.

Gaza Strip is approximately 365 km² (141 sq mi), while Catalina Island is approximately 194 km² (75 sq mi), making Catalina Island 53.2% the size of Gaza Strip.
Tip: This to-scale comparison of Gaza Strip vs. Catalina Island uses the Mercator projection, which distorts the size of regions near the poles.
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